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Boost gauge problems

Discussion in 'A3/S3 Forum (8L Chassis)' started by James TQ, Sep 29, 2012.

  1. James TQ
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    James TQ Member

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    [Sep 29, 2012]
    I fitted a manual gauge today and it sits normal when the engines off when the engine is running the gauge is way below the - on the scale ad when on boost it Dosnt make 0.5 on the scale? Car is a 99 a3 Quattro Jetex filter fmic 008 DV I teed the vac pipe on the fpr line, any ideas?

    Thanks!!
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  3. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Sep 29, 2012]
    0.5 what?
    what units?
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  4. James TQ
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    James TQ Member

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    [Sep 29, 2012]
    Bar I presume?
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  5. James TQ
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    James TQ Member

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    [Sep 29, 2012]
    Faulty gauge maybe?
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  6. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Sep 29, 2012]
    So what does the gauge read when idleing? Also is the car remapped? Btw change the feed from the fpr to the dv, if theirs every a boost leak from that area due to rhe t piece itll **** your fueling up.
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  7. jimmcgee
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    jimmcgee Member

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    [Sep 29, 2012]
    1 BAR is 14psi so your gauge is never going to go over .5 , unless its chipped .
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  8. James TQ
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    James TQ Member

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    [Sep 29, 2012]
    When it's on idle the need is pointing south.... Straight down, then when I rev it rises car isn't mapped and yeh I'm sure there's no leaks check and replaced a fair few pipes. It's only a cheapo gauge from eBay but just worried the vac is too strong or somthing
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  9. badger5
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    [Sep 30, 2012]
    sounds like a shyte gauge
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  10. Jumble
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    Jumble New Member

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    [Sep 30, 2012]
    What boost should a standard car run at. I have monitoring mine on Torque but have been getting some quite bizarre readings. Was going to get a mechanical gauge to see what readings i got from that.
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  11. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Sep 30, 2012]
    i see -0.7bar on idle on a stack boost gauge, and -9.3psi on my dyno logger on idle

    *guide*
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  12. James TQ
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    James TQ Member

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    [Sep 30, 2012]
    What should a stock a3 Quattro run any ideas?
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  13. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Sep 30, 2012]
    the same - its idle
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  14. Dani_B19
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    Dani_B19 Audi-sports own special child.

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    [Sep 30, 2012]
    My s3 idles at -20pis on my stack gauge!
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  15. badger5
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    badger5 www.badger5.co.uk Site Sponsor

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    [Sep 30, 2012]
    wow thats too high to be plausable unless you idle at 2krpm :p
    Last edited: Sep 30, 2012
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  16. s3dave
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    s3dave TFSI Hybrid Supporter

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    [Oct 1, 2012]
    Mine is -20 IN HG too normal idle..
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  17. badger5
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    [Oct 1, 2012]
    inaccuracies of pressure gauges in vacuum I guess....
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  18. s3dave
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    s3dave TFSI Hybrid Supporter

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    [Oct 1, 2012]
    Hmm i thought this so i swapped for a pro sport Digital and reads exactly the same... Is that to high then Bill?
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  19. Jumble
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    Jumble New Member

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    [Oct 1, 2012]
    Just been out and taken an idle reading from mine using Torque app and getting around -22in/hg
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  20. Prawn
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    Prawn My other car is a MINI!!!!

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    [Oct 1, 2012]
    Mine's the same, around -20 on the gauge on idle. All the 1.8T's I've seen have been on various different gauges too.

    James, an unmapped TQ isn't going to be making much boost anyway, the turbo is more of a paperweight than a boost in power. I think stock boost is around 10psi which is around 0.6-0.7 bar.
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  21. James TQ
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    James TQ Member

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    [Oct 2, 2012]
    Ill wait untill I get a new gauge. What if there's too much vac what's the cause of that?
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  22. badger5
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    [Oct 2, 2012]
    why are you fretting about vacuum????
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  23. superkarl
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    superkarl MAN OF STEEL

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    [Oct 2, 2012]
    OP doesnt mention units at all. so how can we advise.

    vaccum is measured in Inhg, which is inches of mercury at 0 degrees C. thats what should be on your gauge on the vacuum side of things. You should read about -20, or there abouts. 1inhg = 0.49psi btw, incase your gauge reads psi.

    boost is as prawn says.

    and dont take the vac off the fpr
    #22
  24. James TQ
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    James TQ Member

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    [Oct 11, 2012]
    Ok so I got a new gauge, it won boots past 0.25bar? It's an un mapped as TQS eBay fmic Jetex filter forge 008, Is this low? Gone over all pipes no leaks? Other things to look for?
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  25. pinci
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    pinci A3 1,8T TQS

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    [Oct 13, 2012]
    Mine Defi boost gauge in idle it runs at -0,7 or -0,8 in vacum...Arround 3000 rpm's the pressure is out of vacum and the car is starting to boost....A3 TQS K03S remaped at full boost around 1,2 bar...In overboost it goes arround 1,3 or 1,4 bar and in some time around 6000 rpm it falls down to 1,00 and 0,9 bar's :)
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  26. James TQ
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    James TQ Member

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    [Oct 13, 2012]
    so mine standard isnt making 0.5bar?... this is low? any ideas why?
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  27. pinci
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    pinci A3 1,8T TQS

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    [Oct 13, 2012]
    Where you have fitted T clamp and vacum hose for the gauge ?

    Maybe the gauge is ok and you installed it properly...Have you tested maybe boost leak or something...Car goes normally ?

    Stock boost I think is about 7-9 psi depends od air temperature and humidity....That aprox.. 0,5 -0,6 bar's ...The gauge readings is in your case correct :)
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  28. James TQ
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    James TQ Member

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    [Oct 14, 2012]
    I t'eed it of the fpr iv gone over the engine so many times looking for leaks ad found none :/ just 0.25 bar seems low boost?
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  29. 16Klappe
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    16Klappe I <3 Panda's! Supporter

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    [Oct 14, 2012]
    This thread hurts my brain.
    #28

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